As of this writing, the tool is found at the URL: WiFi.Google.com/download.html.
A FAQ file at the site describes the Windows-only software as ''a downloadable client application that allows users to establish a more secure WiFi connection.'' It connects to a Google virtual private network (VPN) server in order to secure connections for end users. This offering puts the company in competition with other software being offered by well-funded companies like JiWire and smaller parties like HotSpotVPN. Unlike the competition, Google will offer Secure Access for free.
The software is, obviously, still in beta -- just like most other Google services, including popular offerings like Gmail.